Western Gull occidentalis(last update:
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Coordinators: 1cy June 2cy Jan 3cy Jan 4cy / sub-ad Jan adult Jan |
Western Gull occidentalis pre-basic moult (2CY), August 1989, California, USA. Picture: Alex Abela.Bird in complete moult. P1-P7 replaced. Atypical sequence in moult, with missing central and inner MC, innermost GC and upper TT. These would be the feathers expected to be replaced again in the partial autumn moult, but there is still a very old innermost MC. Maybe some birds have a very early overlap of partial moult in coverts during the complete moult cycle. |